neuronbot freezing temp watch

temp.js

function(msg) {
  var override = false;
  var temp_match = /^temp(\s+(\w+))?$/.exec(msg.message)
  if(temp_match) {
    override = true;
  }
  
  if(override || (msg.type == "ticktock" && (new Date(Date.parse(msg.message))).getMinutes() % 15 == 0) ) {
    var station
    if(override){
      if(temp_match[2]){
        station = temp_match[2].toUpperCase()
        station_set(msg.nick, station)
      } else {
        station = station_find(msg.nick)
      }
    } else {
      station = station_find('autotimer')
    }
    var data = http.get("http://api.wunderground.com/weatherstation/WXCurrentObXML.asp?ID="+station).replace(/\n/g,"").replace(/\r/g,"")
    var entry_ex = /<temp_f>([^<]+)<\/temp_f>/g 
    var temp = entry_ex.exec(data)[1]
    var entry_ex2 = /<neighborhood>([^<]+)<\/neighborhood>/g 
    var neighborhood = entry_ex2.exec(data)[1]
    var entry_ex3 = /<observation_time_rfc822>([^<]+)<\/observation_time_rfc822>/g 
    var observation = entry_ex3.exec(data)[1]
    var date = new Date(observation)

    var say = "";
    var last_freeze_announce_time = new Date(db.get('pdx_freeze_last_date'))
    var freeze_announce_delay_mins = ((new Date()) - last_freeze_announce_time)/1000/60
    var observation_delay_mins = ((new Date ()) - date)/1000/60
    if(override || (temp < 33 && observation_delay_mins < 60 && freeze_announce_delay_mins > 60*12)) {
      if(!override) { 
        db.set('pdx_freeze_last_date', observation)
        say += "Freeze Alert: "
      }
      say += neighborhood+"/"+station.toLowerCase()+": "+temp+"F. observed "+observation_delay_mins.toFixed(1)+" mins ago"
    }
    
    if(override) {
      say = msg.nick+": "+say
    } else {
      bot.emit({type:"temp", temp_f: temp, station: station.toLowerCase(), date: date})
      db.set('outside:f', temp)
      db.set('outside:time', date)
      say = {target:"#pdxtech", message: say}
    }
    return say
  }

  function station_find(nick){
    return (station_list()[nick]) || "KORPORTL198"
  }

  function station_set(nick, station){
    var stations = station_list()
    stations[nick] = station
    db.set("weather:stations", JSON.stringify(stations))
  }

  function station_list(){
    var key = "weather:stations"
    var stations_json = db.get(key)
    var stations
    if(stations_json){
      stations = JSON.parse(stations_json)
    } else {
      db.set(key,"{}")
      stations = {}
    }
    return stations
  }

}